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The English Channel.
It is a channel in the Atlantic Ocean between mainland Europe and the island of Great Britain and connects the North Sea to the Atlantic Ocean. It is about 560 km long and 240 km wide, with a narrow 34 km, between the cities of Dover and Calais.
In 1988, excavations began under the English Channel and opened in 1994, connecting England and France. The tunnel is 50.5 km long. They are operated by high-speed trains called Eurostar.
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